Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: netfilter: xtables: restrict several matches to inet family This is a partial revert of: commit ab4f21e6fb1c ("netfilter: xtables: use NFPROTO_UNSPEC in more extensions") to allow ipv4 and ipv6 only. - xt_mac - xt_owner - xt_physdev These extensions are not used by ebtables in userspace. Moreover, xt_realm is only for ipv4, since dst->tclassid is ipv4 specific.

Affected versions

Linux: ab4f21e6fb1c09b13c4c3cb8357babe8223471bd through before 14203f9edf944b3fb63faadd62f38452421ecdfc (git); ab4f21e6fb1c09b13c4c3cb8357babe8223471bd through before 7eaf9c740f33230cb224dc265f3c69f8531ff57b (git); ab4f21e6fb1c09b13c4c3cb8357babe8223471bd through before 9a109751b297b0f2135495749ef5a18ba31ec7d4 (git); ab4f21e6fb1c09b13c4c3cb8357babe8223471bd through before cbeb259f31382de70a70a59ffd0e66f5e80d9818 (git); ab4f21e6fb1c09b13c4c3cb8357babe8223471bd through before 689a91ff18d6448d94c1ab7c076fecdb2b668bef (git); ab4f21e6fb1c09b13c4c3cb8357babe8223471bd through before 76160e04440c9698b989dbd9492a7ec4f520c9ee (git); ab4f21e6fb1c09b13c4c3cb8357babe8223471bd through before fa88161ef56e29bdaa05cc89dbc4ee221e94bfe9 (git); ab4f21e6fb1c09b13c4c3cb8357babe8223471bd through before b6fe26f86a1649f84e057f3f15605b08eda15497 (git); 2.6.28; V3.1.6 through before * (custom) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.